The project
Stockholm Exergi, Stockholm’s energy provider, is building a large-scale facility for CO₂ capture and permanent storage (Bio-Energy with Carbon Capture and Storage - Bio-CCS or BECCS) at the existing biomass combined heat and power plant in Stockholm.
The Bio-CCS plant is designed to capture 800,000 tonnes of biogenic carbon dioxide annually - more than the emissions from Stockholm's road traffic over the same period – by processing flue gases from the 375 MW biomass-fueled Värtaverket power plant.
The captured CO₂ will be transported in its gaseous phase from the CO₂ capture plant for compression, conditioning, and liquefaction, before being stored as a liquid in the CO₂ buffer storage. Finally, the CO₂ will be loaded onto ships under cryogenic conditions for transportation to its final permanent Northern Light storage site.
Saipem is designing and building the carbon capture unit, the CO₂ storage and out-shipment facilities, and installing and constructing the CO₂ compression and liquefaction units.
Due to its location near a residential area in Stockholm, within a dismissed industrial site and an exceptionally limited footprint (~15,500 m²), the project faces unique logistical challenges. These include a five-story building housing the plant facilities, a strict “just-in-time” material delivery approach, and the mobilisation of a 3,200-tonne ring crane—150 m high with a 50 m operating radius.
Once completed, the plant will be one of the world's largest facilities for the capture and permanent storage of biogenic carbon dioxide.